.questionMark circle {
    fill: #888888;
    stroke: white;
    stroke-width: 2;
}
.questionMark text {
    text-anchor: middle;
    font-family: cursive;
    fill: white;
}

.leafNode rect:nth-child(odd) {
    fill: #555555;
}
.leafNode rect:nth-child(even) {
    filL: #898989;
}
.leafNode text {
    font-family: 'Microsoft YaHei';
    fill: white;
}

.polyline polyline {
    stroke: #898987;
    fill: none;
    stroke-width: 3;
    stroke-linecap: square;
}